<template>
	<view>
		<!-- 搜索区域 -->
		<view class="search-box">
			<uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="kw.length !== 0">
			<view class="sugg-item" v-for="(item,index) in searchResults" :key="index" @click="gotoDetail(item.goods_id)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="forward" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,index) in histories" :key="index" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				searchResults:[],  // 用户搜索的结果
				historyList:['a','app','1']  // 搜索历史
			}
		},
		onLoad() {
			// uni.getStorageSync('kw')   键
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '')
		},
		methods:{
			// input 输入事件函数
			input(e){
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					console.log(e)
					this.kw = e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				// 判断搜索关键词是否为空
				if(this.kw.trim() === ''){
					this.searchResults = []
					return
				}
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
				if(res.meta.status != 200) return uni.showMsg('')
				this.searchResults = res.message
				this.saveSearchHistory()
			},
			gotoDetail(goods_id){
				console.log(goods_id)
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods_id
				})
			},
			// 保存搜索历史记录
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				
				// 解决搜索关键词重复问题
				// 将Araary对象转换为数组
				const set = new Set(this.historyList)
				// 调用set delete  移除对应的元素
				set.delete(this.kw)
				// 调用set  add  添加对应的元素
				set.add(this.kw)
				// 将Set对象转换为数组
				this.historyList = Array.from(set)
				
				// 将搜索记录持久化存储到本地 uni.setStorageSyn()  键名 值
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			// 清空历史数据
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		},
		computed:{
			histories(){
				// 利用 ... 展开运算符得到新的数组  因为reverse()会改变原数组
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
// 搜索区域
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
	background-color: #8c44f8;
}
// 搜索建议列表去
.sugg-list{
	display: flex;
	flex-direction: column;
	padding: 0 5px;
	.sugg-item{
		display: flex;
		align-items: center;
		justify-content: space-between;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		.goods-name{
			// 文字不允许换行（单行文本）
			white-space: nowrap;
			// 溢出部分隐藏
			overflow: hidden;
			// 文本溢出后，使用 ... 代替
			text-overflow: ellipsis;
		}
	}
}
// 搜索历史区域
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
